Sample radioactive sources are for testing the functionality of a Geiger counter and for performing experiments involving radioactivity.
They are fabricated by depositing a license exempt quantity of radioactive material in the well of a 1-inch diameter (25mm) by 1/8-inch thick (3mm) plastic disk.
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History Roughly 50 years ago, a small group of scientists from Belgium and the USA, trying to better constrain ice sheet accumulation rates, attempted to apply what was then known about environmental lead as a potential geochronometer.